从Ⅱ栏中找出与Ⅰ栏相匹配的句子。

Ⅰ                                                     Ⅱ

小题1: Helen did badly in the math exam.  A. We usually feel sad.

小题2: Wang Fang looks unhappy.           B. I ask my teacher to help me.

小题3: I moved to this new city this year. C. I am a stranger.

小题4: I don’t know how to solve this problem.  D. Her father is ill.

小题5: When something bad happens to us.     E. She is upset.

在平巷行车的轨道上作业时，如何设置作业标和信号灯？